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Evaporative fuel-processing system for internal combustion engines

  • US 5,617,832 A
  • Filed: 06/04/1996
  • Issued: 04/08/1997
  • Est. Priority Date: 06/05/1995
  • Status: Expired due to Fees
First Claim
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1. An evaporative fuel-processing system for an internal combustion engine having a fuel tank and an intake system, comprising:

  • an evaporative emission control system including a canister having an air inlet port formed therein, for introducing atmosphere into said canister, said canister accommodating an adsorbent for adsorbing evaporative fuel generated in said fuel tank, a charging passage connecting between said canister and said fuel tank, a two-way valve arranged across said charging passage, a purging passage connecting between said canister and said intake system, and a purge control valve arranged across said purging passage;

    leak-checking means for carrying out leak-checking of said evaporative emission control system;

    a bypass passage bypassing said two-way valve;

    a negative pressure responsive-type bypass valve arranged across said bypass passage; and

    a negative pressure responsive-type vent shut valve disposed to open and close said air inlet port of said canister;

    wherein said leak-checking means controls said bypass valve and said vent shut valve to open and close, by means of negative pressure developed within said intake system.

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